Reset configured_fps of the stream when its fps configuration change. The condition to change the fps is based on this variable. As it is never changed outside of the initialization, it tries to set a new configuration each time where the target fps is too far way than the current fps. The order of the set (from MS_VIDEO_ENCODER_SET_CONFIGURATION) is based on configure_video_source().
Fix bitrate for stream that has set its max target bitrate. This fix the wrong bitrate for thumbnails (which should be at 80Kb/s)